This may be the same as https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1634449 It can reliably be triggered by just crossing the cursor back and forth between screens, but it does not only occur then; often it is a keypress in window (terminal, etc) which triggers it, even when the cursor was already there.
** Summary changed: - Screens all flash to black for ~1 s periodically under extended desktop + External screen flashes to black for ~1 s periodically under extended desktop -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1658497 Title: External screen flashes to black for ~1 s periodically under extended desktop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1658497/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
